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Wiring Most of the 12 Volt wiring in RVs is done using 12 or 14 ga. twinlead. The most common seems to be white with a black trace to denote the positive wire. When in doubt, check with a meter to determine which is positive and which is ground. A lot of RVs also use a crimp style connector to tap into these 12 volt wires to hook up lights and other low current devices. I don't personally care for these crimp connectors as they can fail over time, so any time I make a new connection, I use either wire nuts or solder and heat shrink to make secure connections. If you intend to install 12 Volt equipment in your RV, it's important to be sure that you use adequately sized wire to meet the amperage requirements of whatever it is that you're installing. Here's a table of wire sizes and amperage ratings that will provide some basic guidelines. This table leans a bit towards heavier wire than is absolutely necessary, but that's actually safer in the long run. Always provide fuse protection of any new wiring that you install. The fuse should be sized so as to protect the wiring from meltdown. Don't put a 20 amp fuse on a circuit wired with 16 ga. wire.
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